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Message: <blockquote data-quote="Fork" data-source="post: 79514" data-attributes="member: 10937"><p>I think the buffer is filling up.  A 20 sec exposure will normally take 20 seconds to write to the memory card.  On long exposures the camera's software will effectively take two "exposures" and combined them to cancel out noise.  I think after a while the images will back up and the buffer will be full, therefore stopping the camera taking any more images.  In your case the buffer is filling up before all your images have been shot.</p></blockquote><p></p>